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Study on Wet Permeability Models of Yarns and Knitted Fabrics

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Journal of Donghua university(English Edition) 2001年第4期18卷 57-58页

作者： Wang Qi(王其) Feng Xunwei(冯勋伟) College of Textiles Dong Hua University Shanghai 200051 College of Textiles Dong Hua University Shanghai 200051

Water transport through the pore structure of the knitted fabric can occur only in place where the fiber-water surface attraction force is greater than the water weight in the capillary. To investigate wet permeability of the knitted yarn in the fabric, a liquid transport model is established. The main factors which have significant influences on the liquid transport have been analyzed. It is derived from the argument that the optimal design for the knitted fabric with quick sweat transport property can be obtained.

关键词： yarn, knitted fabric, wet permeability model.

Realization of 3D Garment Rendering Using Texture Mapping Technology

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Journal of Donghua university(English Edition) 2001年第2期18卷 45-48页

作者： Zhang Ruiyun(张瑞云) Li Ruqin(李汝勤) College of Textiles Dong Hua University Shanghai 200051 College of Textiles Dong Hua University Shanghai 200051

After a review of the planar garment effect production of pattern fabric and a brief introduction of the concept of texture mapping, the theory of 2D texture mapping onto 3D surface is stated. And the calculation procedures of texture mapping, such as texture image preprocess,mannequin and garment surface modeling, mapping relationship definition, shading/texturing model creation, and graphic transformation,are exploited to produce a real 3D garment rendring ***, the conclusion is given about the realization envlronment and affecting factors of the final images.

关键词： texture mapping, 3D-garment rendering, shading/texturing model

Model to Study Resin Impregnation Process of Premix Made of Friction Spun Core Yarn

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Journal of Donghua university(English Edition) 2001年第2期18卷 1-4页

作者： Ding Xin(丁辛) WuXedong(吴学东) College of Textiles Dong Hua University Shanghai 200051 College of Textiles Dong Hua University Shanghai 200051

A model was deveIoped to investigate impregnation behavior of thermoplastic resin into filament bundle based on Darcy's law. Consolidation processes of unidirectional laminate were performed to evaluate the validity of the model. Friction spun core yarns were used in the experiments with polypropylene fiber sheath and glass filament core. The processing conditions, such as temperature and pressure, and filament parameters were taken into consideration. A good agreement was found between theoretical prediction and experiment data.

关键词： resin impregnation, consolidation process, friction spun core yarn, thermoplastic composite.

Improving Adaptive Learning Rate of BP Neural Network for the Modelling of 3D Woven Composites Using the Golden Section Law

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Journal of Donghua university(English Edition) 2001年第1期18卷 81-84页

作者： Yi Honglei(易洪雷) Ding Xin(丁辛) College of Textiles Dong Hua University Shanghai 200051 College of Textiles Dong Hua University Shanghai 200051

Focused on various BP algorithms with variable learning rate based on network system error gradient, a modified learning strategy for training non-linear network models is developed with both the incremental and the decremental factors of network learning rate being adjusted adaptively and dynamically. The golden section law is put forward to build a relationship between the network training parameters, and a series of data from an existing model is used to train and test the network parameters. By means of the evaluation of network performance in respect to convergent speed and predicting precision, the effectiveness of the proposed learning strategy can be illustrated.

关键词： BP algorithm, adaptive adjustment, network training parameter, learning strategy, network performance evaluation.

Wet Permeability and Moisture Vapor Transmission Characteristics of Soybean Knitted Fabrics

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Journal of Donghua university(English Edition) 2001年第3期18卷 117-119页

作者： WangQi(王其) Feng xunwei(冯勋伟) College of Textiles Dong Hua University Shanghai 200051 College of Textiles Dong Hua University Shanghai 200051

Wet permeability of fibrous assembly is mainly influenced by the properties of liquid and the configurations of the fiber which consist of diameter of fiber, twist angle and fiber alignment in a yarn. It can be seen from experimental results that the knitted fabric made of soybean (SB) fiber has goodproperties both in wet permeability and vapor transmission so that the knitting technology and fabric characteristics can be improved.

关键词： SB fiber, knitted fabric, properties.

Flexural Properties of Weft Knitted Fabric Reinforced Composites

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Journal of Donghua university(English Edition) 2001年第4期18卷 78-80页

作者： Long Hairu(龙海如) Feng Xunwei(冯勋伟) College of Textiles Dong Hua University Shanghai 200051 College of Textiles Dong Hua University Shanghai 200051

Several different kinds of weft knitted fabrics from glass fiber yarns were used as reinforcement to make fabric/polyester composite laminates. Flexural tests were carried out to examine stress- deflection process and compare the mechanical properties in course and wale directions of these composites. The experimental results indicate that the numbers of load-bearing yarn in course and wale direction and the fabric density are the main factors influencing the ultimate tensile strength and initial elastic modulus of specimens.

关键词： weft knitted fabric, glass fiber/ polyester composite,flexural properties

Optical Properties of Fluorescent Dyes

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Journal of Donghua university(English Edition) 2001年第1期18卷 27-31页

作者： LiRong(李戎) Chen Donghui(陈东辉) School of Graduate Dong Hua University Shanghai 200051 School of Graduate Dong Hua University Shanghai 200051

Fluorescent dyes have been widely used these *** of the special optical performance, conventional CCM systems seem to be unable to predict the recipes of fabrics dyed with fluorescent dyes. In order to enhance the functions of CCM systems, the optical properties of fluorescent dyes in their absorption region were investigated. It has been found that there was a fixed maximum absorption wavelength for each fluorescent dyes whatever its concentration is. Both absorption region and maximum absorption wavelength of the dyes in solution are the same to those in fabric, and that the absorption is directly proportional to the concentration of the dye. So the optical properties obtained in solutions cna be applied for describing the optics performance of fluorescent dyes in fabrics.

关键词： fluorescent dyes, absorption region, solution,fabric

同方期刊数据库

Evaluation of Image-Analysis-Based Drape Tester

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Journal of Donghua university(English Edition) 2001年第2期18卷 97-100页

作者： GuoYongping(郭永平) Li Ruqin(李汝勤) College of Textile Dong Hua University Shanghai 200051 College of Textile Dong Hua University Shanghai 200051

The performance of image-analysis-based drape tester is studied by analyzing the testing results. The accelerating and decelerating method is used to make the initial testing condition same before draping. A feature vector is proposed to describe the drapenbility of fabrics comprehensively. Moreover, the exponential relationship curves between drape coefficient and rotating speed are obtained from the drape tester to describe the dynamic drapeability Finally, the stability of tested results of image-analysis-based system is studied.

关键词： Image analysis, drape coefficient, feature vector,drapeability

Knitting and Finishing of Ramie Knitted Fabrics Blended with Fine Polyester

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Journal of Donghua university(English Edition) 2001年第2期18卷 119-121页

作者： Li Wei(李炜) Feng Xunwei(冯勋伟) College of Textiles Dong Hua University Shanghai 200051 College of Textiles Dong Hua University Shanghai 200051

Ramie fibre is harsh and rigid. Ramie yarns have a hairy feel and reduced cohesion. A considerable amount of research has been done to ease the undesirable properties of ramie products through modifying conditions of knitting and finishing according to the special properties of the ramie yarn. From the comparison results, burning the hairiness is shown as one of the effective methods to improve the properties of the yarn. A typical finishing condition with enzyme treatment is also recommended.

关键词： ramie, blend, knitting, bleach, enzyme